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Baxi 428 Combi Gas Boiler

From: £1,779.00

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428 Combi Gas Boiler

Is Condensing


Efficiency Rating


Band Rating

A Rated

LPG Compatible


Standard Warranty

5 Years

Central Heating Max. Output

21.8 kW


Wall mounted

Flow Rate

11.5 l/min

ERP Rating

A Heat, A Water

Hot Water Max. Output

28 kW

Product Description

Designed and manufactured by Baxi, the 428 combi gas boiler is a highly efficient and reliable boiler that’s ideal for smaller properties.

How efficient is the Baxi 428?

Installing a Baxi 428 as part of your central heating system could help to lower your heating bills. This is because the boiler operates at an efficiency rating of 93% and has been awarded an ErP A-rating for heat and hot water.

Is the output rating suitable for my home?

As a combi boiler, the Baxi 428 has 2 output ratings: central heating (CH) output and domestic hot water (DHW) output. This model has a CH output of 21.8 kW and DHW output of 28 kW making it well suited to properties with up to 10 radiators and a single bathroom.

Are any other options available in the Baxi 400 range?

Alongside the Baxi 428 is the 424, another combi boiler with a slightly lower domestic hot water output rating of 24 kW.

Is a combi boiler suitable for my home?

A combi boiler is the best option for small to medium-sized properties with 1 bathroom (potentially 2 depending on the ouptut rating. A major benefit of combi boilers is that they heat water directly from the mains and deliver it straight to the central heating system or hot water outlets as and when needed. This removes the need for any additional tanks or cylinders, helping to save space around the home.

How long is the warranty period?

The Baxi 428 is covered by a 5 year parts and labour warranty that will see you’re covered by the manufacturer after the installation.

What are the key features of the Baxi 428?

This boiler features a rigid filling loop and optional stand off frame to offer extra versatility and ease of use. The 428 has been designed so that the pipework is hidden away, making for a neater installation too.

As well as the ability of being controlled by your smartphone, this boiler is compatible with many of Baxi’s peripheral accessories offering you additional options of control.

The unit also offers many different flue lengths, bends, and accessories – meaning you can place it pretty much anywhere.

How big is the Baxi 428?

As well as flexible installation, this is a compact boiler with dimensions of only 700x395x297mm (HxWxD) which means that it can be installed within a standard kitchen cupboard.